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WO2019035750A1 - Procédé et dispositif de transition destinés à l'établissement de communication de données dans un réseau sans fil - Google Patents

Procédé et dispositif de transition destinés à l'établissement de communication de données dans un réseau sans fil Download PDF

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Publication number
WO2019035750A1
WO2019035750A1 PCT/SE2017/050828 SE2017050828W WO2019035750A1 WO 2019035750 A1 WO2019035750 A1 WO 2019035750A1 SE 2017050828 W SE2017050828 W SE 2017050828W WO 2019035750 A1 WO2019035750 A1 WO 2019035750A1
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WO
WIPO (PCT)
Prior art keywords
interface
transition device
functions
interface configuration
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2017/050828
Other languages
English (en)
Inventor
Miguel Berg
Per-Erik Eriksson
Chenguang Lu
Jacob ÖSTERLING
Elmar Trojer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to ES17758653T priority Critical patent/ES2964760T3/es
Priority to EP17758653.4A priority patent/EP3669567B1/fr
Priority to US16/628,890 priority patent/US11337114B2/en
Priority to PCT/SE2017/050828 priority patent/WO2019035750A1/fr
Priority to EP23201077.7A priority patent/EP4277439A3/fr
Publication of WO2019035750A1 publication Critical patent/WO2019035750A1/fr
Anticipated expiration legal-status Critical
Priority to US17/726,616 priority patent/US11902834B2/en
Priority to US18/536,441 priority patent/US12238581B2/en
Priority to US18/987,371 priority patent/US20250119793A1/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/181—Transcoding devices; Rate adaptation devices
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44—Arrangements for executing specific programs
    • G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
    • G06F9/45533—Hypervisors; Virtual machine monitors
    • G06F9/45558—Hypervisor-specific management and integration aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/085—Retrieval of network configuration; Tracking network configuration history
    • H04L41/0853—Retrieval of network configuration; Tracking network configuration history by actively collecting configuration information or by backing up configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0876—Aspects of the degree of configuration automation
    • H04L41/0886—Fully automatic configuration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44—Arrangements for executing specific programs
    • G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
    • G06F9/45533—Hypervisors; Virtual machine monitors
    • G06F9/45558—Hypervisor-specific management and integration aspects
    • G06F2009/45595—Network integration; Enabling network access in virtual machine instances
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present disclosure relates generally to a method and a transition device, for enabling communication of data between a remote radio unit and a central baseband unit in a wireless network.
  • RRU remote radio unit
  • BBU baseband unit
  • a single centralized baseband unit equipped with processing means may thus be connected to multiple remote radio units equipped with antennas, so that radio signals communicated locally by several remote radio units are processed centrally by the baseband unit.
  • the BBU can also be capable of handling several different protocols and functions, depending on which Radio Access Technology (RAT) and/or type of Radio Access Network (RAN) are used by the respective RRUs.
  • Fig. 1 illustrates a simplified wireless network where a central baseband unit BBU 100 is connected to multiple remote radio units RRUs 102 equipped with antennas, which may include a single antenna on some RRUs and multiple antennas on other RRUs, as schematically indicated.
  • RRUs 102 are shown with a single antenna in this example, each RRU may comprise any number of antennas and when beamforming and/or Multiple-lnput-Multiple-Output (MIMO) are employed, a RRU may have a large number of antennas and a data flow may be needed for each antenna.
  • MIMO Multiple-lnput-Multiple-Output
  • a RRU may have a large number of antennas and a data flow may be needed for each antenna.
  • radio signals received by the RRUs 102 in uplink communication are conveyed to the B
  • the above-described functionality split can be implemented for multi- standard RANs, e.g. involving 2G/3G/4G networks, based on the interface between RRU and BBU, e.g. the above-mentioned CPRI.
  • the RRUs 102 handle various radio functions for one or more antennas, which for downlink transmission typically include power amplification, filtering, digital pre- distortion, etc., which are usually frequency band-specific.
  • Radio functions for uplink reception typically include RF filtering, Low-Noise Amplification, automatic gain control, down-conversion, A/D conversion, carrier de-multiplexing, and carrier filtering.
  • the RRUs 102 further perform a conversion between Radio Frequency (RF) signals and IQ samples and transport the IQ samples in so-called antenna-carriers (AxC) via the CPRI interface.
  • An antenna carrier is basically an IQ sample flow corresponding to one radio carrier on one antenna.
  • the above radio functions are thus basically employed for uplink communication and corresponding radio functions can be employed in the RRUs 102 for downlink communication when IQ samples received from the BBU 100 are converted into RF signals for
  • CPRI has been specified by the CPRI Industry Cooperation for use as a fronthaul (FH) interface in wireless networks, and CPRI is widely adopted in wireless networks of today.
  • FH fronthaul
  • CPRI specifies the protocol for the current RRU-BBU interface, transporting the baseband IQ samples and any related signaling.
  • Such an RRU-BBU function split is often referred to as an RF-PHY split, as RF functions are implemented in the RRUs while the processing of the physical layer, referred to as PHY, and above protocol layers is made in the BBU.
  • CPRI enables the RF-PHY split design of distributing radio functionality to multiple distributed RRUs while baseband functionality is centralized to one or more BBUs.
  • CPRI further provides a means that multiplexes/ de-multiplexes signals of different flows and manages AxCs between BBU and RRUs.
  • CPRI also supports various existing RATs, such as 2G, 3G and 4G, as well as different transmission modes, such as frequency division duplex (FDD) and time division duplex (TDD), and signal configurations e.g. related to carrier bandwidth, layers of diversity/MIMO, spatial beam-forming, etc., in a uniform stream format over electrical and optical 5 interfaces.
  • FDD frequency division duplex
  • TDD time division duplex
  • CPRI can be used to transport IQ samples as well as signals related to
  • the current CPRI-based RF-PHY split may be too costly for deployment in a network designed for 5G for the following reasons.
  • the carrier bandwidth e.g. 200 MHz
  • the number of antennas e.g. 64, 128 or 256
  • the required FH capacity may be increased from supporting one or a few
  • One alternative is to compress the FH data which enables the RF-PHY split of 4G to be kept. This is especially conceivable when the number of antennas is not too high, e.g. no more than 64 antennas. This facilitates reuse of existing designs of RRU and BBU. Compression of FH data means basically using an IQ sample representation with reduced bit rate. A lower bit
  • 25 rate can be achieved e.g. by reducing the number of quantization steps
  • Another alternative is to use another functional split at a higher position in the protocol stack, which requires new designs of the RRUs and the BBU.
  • the split may be realized between MIMO processing, e.g. beamforming, and user-layer processing when multiple antennas are used at the RRUs.
  • MIMO processing e.g. beamforming
  • user-layer processing when multiple antennas are used at the RRUs.
  • RRU transforms AxC signals to frequency domain by performing OFDM demodulation including synchronization, Cyclic Prefix (CP) removal and a Fast Fourier Transform (FFT) operation. For downlink, a corresponding OFDM modulation is performed.
  • the RRU further performs
  • eCPRI evolved CPRI which supports a functional split within the PHY, enabling a ten-fold reduction of the required bandwidth.
  • the functional split may be vendor-specific. Different vendors may thus have different implementation variants on the same level of a split, for example, within the PHY layer.
  • an interface must be adapted and established manually between each RRU and a BBU, e.g. as shown in Fig. 1 , so as to fulfil the specific capabilities and requirements of said RRU and BBU, and a given RRU typically supports one CPRI rate only so that any changes of RRUs and BBUs often require manual operations.
  • a method is performed by a transition device for enabling communication of data between a remote radio unit and a central baseband unit (204) in a wireless network.
  • the transition device detects a first interface configuration used by the remote radio unit, and also detects a second interface configuration used by the baseband unit.
  • the transition device then configures one or more interface functions, based on the detected first and second interface configurations, the one or more interface functions being selected from a set of predefined interface functions associated with different interface
  • the transition device further establishes at least one data flow between the remote radio unit and the central baseband unit over the transition device, and performs conversion between the first interface configuration and the second interface configuration for data communicated in the at least one data flow, using the selected one or more interface functions.
  • a transition device is arranged to enable
  • the transition device is configured to detect a first interface configuration used by the remote radio unit, and to detect a second interface configuration used by the central baseband unit.
  • the transition device is also configured to configure one or more interface functions, based on the detected first and second interface configurations, the one or more interface functions being selected from a set of predefined interface functions associated with different interface configurations.
  • the transition device is further configured to establish at least one data flow between the remote radio unit and the central baseband unit over the transition device, and to perform conversion between the first interface configuration and the second interface configuration for data communicated in the at least one data flow, using the selected one or more interface functions.
  • the transition device is a single transition point that effectively interconnects any number of remote radio units to any baseband unit in an automated and flexible manner. Another advantage is that the transition device performs conversion between any interface configurations that might be used by the remote radio units and the baseband unit, respectively. Further, no manual adaptations are necessary when a new remote radio unit is connected to a baseband unit, or when an existing remote radio unit or a baseband unit is modified in some way, regardless of which interface configuration is used by either unit.
  • the above method and transition device may be configured and implemented according to different optional embodiments to accomplish further features and benefits, to be described below.
  • Fig. 1 is a network scenario illustrating how interfaces are employed between a baseband unit and different remote radio units, according to the prior art.
  • Fig. 2 is a network scenario illustrating an example of how the solution may be employed by means of a transition device, according to some example
  • Fig. 3 is a flow chart illustrating a procedure in a transition device, according to further example embodiments.
  • Fig. 4 is a signaling diagram illustrating an example of a procedure when the solution is used, according to further example embodiments.
  • Figs 5 and 5A are block diagrams illustrating how a transition device may be structured, according to further example embodiments.
  • Fig. 6 illustrates three example communication scenarios where the transition device is divided into a first part and a second part, according to further example embodiments.
  • Fig. 7 is a block diagram illustrating a more detailed example of how a transition device may be structured, according to further example embodiments.
  • Fig. 8 is a block diagram illustrating an example of how a transition device may be structured for conversion between a CPRI interface configuration and a C1 interface configuration, according to further example embodiments.
  • Fig. 9 is a block diagram illustrating an example of how a transition device may be structured for conversion between a CPRI interface configuration and a C2 interface configuration, according to further example embodiments.
  • Fig. 10 is a block diagram illustrating an example of how a transition device may be structured for conversion between a C1 interface configuration and a C2 interface configuration, according to further example embodiments.
  • a solution is provided to avoid the need for manual adaptations e.g. when a new RRU is connected to a BBU in a wireless network, or when an RRU or a BBU is modified in terms of capabilities and functionality, regardless of which interface configuration is used by either of the RRU and the BBU.
  • This can be achieved by means of a transition device which connects an RRU to a BBU, e.g. as illustrated in Fig. 2 where a transition device 200 is able to connect any RRU 202 to any BBU 204 and automatically establish a data flow between them using suitable interface configurations as follows.
  • the transition device 200 identifies or selects a BBU 204 to handle signal processing for the RRU, and detects which interface configurations are used by the RRU 202 and by the BBU 204, respectively. For example, the transition device may detect attached BBUs by "snooping" the data protocol used. Further, ports on the transition device 200 can be configured manually, which means that the device can be informed if an RRU or BBU is connected on a particular port and which interface type the port should be configured to. This type of information may be maintained in a database 200A. The transition device 200 accordingly configures interface functions for the two detected interface configurations, which interface functions are selected from a set of predefined interface functions associated with different interface configurations.
  • Such predefined interface functions may also be available from the database 200A which basically maps various known interface configurations to respective interface functions required for communication on the interfaces.
  • a data flow is then established between the RRU 202 and the BBU 204 over the transition device 200, and conversion is performed between the interface configuration used by the RRU 202 and the interface configuration used by the BBU 204. Data is thereby communicated in said data flow using the selected interface functions.
  • data flows can be established between several RRUs and a single BBU, and the solution is not limited in this respect. In this case, multiplexing and de-multiplexing of multiple data flows can be made in the transition device.
  • RRU Remote Radio Unit
  • BBU Central Baseband Unit
  • interface configurations that may occur in this context include: 1 ) the above-mentioned Common Public Radio Interface CPRI, 2) the above-mentioned evolved Common Public Radio Interface eCPRI,
  • C2 intra-physical layer split interface
  • C3 physical layer/MAC layer split interface
  • the C1 interface is a packet-based interface between the RF layer and the PHY layer
  • the C2 interface is within the PHY layer thus splitting the PHY layer into two parts
  • the C3 interface is between the PHY layer and the MAC layer.
  • the C1 interface carries time-domain IQ samples which may be compressed
  • the C2 interface may carry frequency-domain signals at least partly processed at the PHY layer
  • the C3 interface may carry user data, configuration and scheduling- related information and measurements.
  • the baseband signal becomes an RF signal after up-conversion.
  • an RF signal is down- converted to baseband signal which is then compressed and transported over the C1 interface.
  • the transition device 200 thus provides interconnection and conversion between any interface configurations used by RRUs and one or more BBUs in a flexible manner and the establishment of such interface conversion is made automatically once the RRU 202 is connected to the transition device 200 and starts to receive and forward radio signals.
  • the transition device 200 can be defined by means of software and can be implemented either on the RRU side or on the BBU side. It is also possible to implement the transition device 200 as split into two parts, one part operating on the RRU side and another part operating on the BBU side, and use a packet network as an "intermediate interface configuration" for data transport between the two transition device parts, which will be described in more detail below.
  • the intermediate interface configuration may alternatively be referred to as a packet network configuration or packet interface configuration.
  • the transition device effectively provides useful external interfaces that are automatically adapted to the connected RRU and the appointed BBU, respectively.
  • the transition device can for example be initialized as software on a multi-purpose processor to provide any necessary interface and forwarding functions such as framing, switching/multiplexing, stream aggregation and extraction, packet manipulation, data compression, synchronization, etc.
  • Fig. 3 An example will now be described with reference to the flow chart in Fig. 3, of how the solution may be employed in terms of actions performed by a transition device such as the above-described transition device 200.
  • Fig. 3 is described below with further reference to Fig. 2 although without limitation to such a communication scenario.
  • the procedure may be employed when the transition device 200 is operating in any type of wireless network and any suitable
  • transition device 200 for communication in this network, e.g. as exemplified below.
  • a transition device 200 for enabling communication of data between a remote radio unit 202 and a central baseband unit 204 in a wireless network.
  • a first action 300 is thus performed by a transition device 200, for enabling communication of data between a remote radio unit 202 and a central baseband unit 204 in a wireless network.
  • the transition device 200 may receive one or more signals from the remote radio unit 202 which has an antenna receiving radio signals from a radio transmitter such as a wireless device.
  • the transition device 200 detects a first interface
  • This interface configuration may be detected from the signals received in action 300, or by some other input to the transition device 200 related to the remote radio unit 202, e.g. manual input.
  • the transition device 200 also detects a second interface configuration used by the baseband unit 204. Similarly, this interface configuration may be detected from the signals received in action 300 from the remote radio unit 202. If the baseband unit 204 is manually configured to communicate with a given remote radio unit 202, it is possible to connect them over the transition device 200 by snooping data on both interfaces.
  • the second interface configuration may be detected from signals or messages received from the baseband unit 204, or by some other input to the transition device 200 related to the baseband unit 204, e.g. manual input.
  • action 304 may be suitable to perform action 304 before action 302, specifically as the baseband unit 204 can be regarded as a "master" for the remote radio unit 202.
  • the order of actions 302 and 304 may thus be reversed and the solution is not limited to any particular order of detecting the first and second interfaces.
  • a next action 306 illustrates that the transition device 200 configures one or more interface functions, based on the detected first and second interface
  • the one or more interface functions are selected from a set of predefined interface functions associated with different interface configurations.
  • a set of predefined interface functions may be available and accessed from a data storage 200A or the like, as said above.
  • the transition device 200 establishes at least one data flow between the remote radio unit 202 and the central baseband unit 204 over the transition device 200.
  • a communication path is thus created through the transition device 200 so as to connect the remote radio unit 202 to the central baseband unit 204 so that the data flow runs over this communication path.
  • the transition device 200 also performs conversion between the first interface configuration and the second interface configuration for data communicated in the at least one data flow, using the selected one or more interface functions, as illustrated by another action 310.
  • the above actions may be carried out in different ways which will be exemplified below.
  • transition device 200 can be used as a single transition point that interconnects any number of RRUs to any BBU in an automated and flexible manner, and that the transition device 200 is able to perform conversion between any interface configurations that might be used by the RRU and the BBU, respectively.
  • the first and second interface configurations may be detected in actions 302, 304 based on one or more signals received from the remote radio unit 202.
  • the remote radio unit 202 has been connected to the transition device 200 and starts to receive radio signals from a wireless device or the like, these signals are conveyed to the transition device 200 which is able to determine from the received signals which interface configurations are used by the remote radio unit 202 and the central baseband unit 204.
  • a BBU may be configured to operate with a particular set of RRUs. So when an RRU is connected to a BBU, an initial handshaking may be conducted by the units where they exchange their identities and capabilities. Being located between the units, the transition device is able to listen to the exchanged information so that it can learn which RRUs belong to which BBU.
  • the first interface configuration may comprise a Common Public Radio Interface CPRI or an interface C1 for conveying compressed data.
  • the second interface configuration may comprise any of an evolved Common Public Radio Interface eCPRI, an interface C1 for conveying compressed data, an intra-physical layer split interface C2 and a physical layer/MAC layer split interface C3.
  • the transition device 200 may be split into two parts, one part operating on the RRU side and another part operating on the BBU side, and that a packet network may then be used as an intermediate interface configuration for packet transport between the two transition device parts.
  • conversion between the first interface configuration and an intermediate interface configuration which is adapted for a packet network may be performed by a first part of the transition device 200, and conversion between said intermediate interface configuration and the second interface configuration may be performed by a second part of the transition device 200.
  • the transition device 200 performs the conversion between the first and second interface configurations in action 310 via the intermediate interface configuration which is adapted for a packet network.
  • the data may in that case be transported over the packet network between said first and second parts of the transition device, using the intermediate interface configuration.
  • the intermediate interface configuration may comprise any of an evolved Common Public Radio Interface eCPRI, an interface C1 for conveying
  • intermediate interface configuration may have been preconfigured in beforehand or it may be selected based on the first and second interface configurations and/or based on properties of the packet network. It was mentioned above that the transition device 200 can be implemented as software on a multi-purpose processor. In further example embodiments, the one or more interface functions may be configured as Virtualized Network Functions VNFs. In that case, another example embodiments, may be that the Virtualized Network Functions could be implemented in a software-defined data processing unit in the transition device 700.
  • the one or more interface functions may comprise any of: CPRI related functions, eCPRI related functions, multiplexing/ demultiplexing and switching functions, and packet forwarding functions.
  • CPRI related functions CPRI related functions
  • eCPRI related functions CPRI related functions
  • multiplexing/ demultiplexing and switching functions packet forwarding functions.
  • packet forwarding functions An example of how these interface functions may be arranged will be described later below with reference to Fig. 7.
  • the one or more interface functions may be related to signal processing which may include any of: Fast Fourier Transform (FFT), beam forming, and compression/decompression.
  • FFT Fast Fourier Transform
  • transition device 400 Another example of how the above-described transition device may operate in a practical communication scenario will now be described with reference to the signaling diagram in Fig. 4.
  • the transition device 400
  • a first action 4:1 illustrates that the transition device 400 initially receives a signal carrying data from the remote radio unit 402 having received the signal from a wireless device, not shown, which corresponds to action 300. Thereby, the transition device 400 is able to detect a first interface configuration 402A used by the remote radio unit 402 and a second interface configuration 404A used by the baseband unit 404, jointly illustrated by an action 4:2. This action corresponds to actions 302 and 304. In a next action 4:3, the transition device 400 selects and configures interface functions, based on the detected first and second interface configurations, which corresponds to action 306.
  • the interface functions are selected from a data storage 400A where a set of predefined interface functions associated with different interface configurations are being stored.
  • the transition device 400 establishes one or more data flows between the remote radio unit 402 and the baseband unit 404 over the transition device 400. This action thus corresponds to action 308.
  • a further action 4:5A illustrates that the transition device 400 receives further uplink signals carrying data from the remote radio unit 402 over the first interface configuration in the data flow.
  • the transition device 400 also performs conversion between the first interface configuration and the second interface configuration for the received data signals in action 4:5B, and forwards the converted data signals to the baseband unit 404 over the second interface configuration in action 4:5C.
  • Actions 4:5A-C are thus executed as long as the data flow is active in an uplink communication.
  • the transition device 400 receives downlink signals carrying data from the baseband unit 404 over the second interface configuration in another data flow, as illustrated by a further action 4:6A.
  • the transition device 400 also performs conversion between the second interface configuration and the first interface configuration for the received data signals in action 4:6B, and forwards the converted data signals to the remote radio unit 402 over the first interface configuration in action 4:6C.
  • the downlink signals are then transmitted from the remote radio unit 402 to be received by a wireless device, not shown.
  • Actions 4:6A-C are thus executed as long as the data flow is active in the downlink communication.
  • the transition device 500 may be configured to operate according to any of the examples and embodiments of employing the solution as described herein, where appropriate and as follows.
  • the transition device 500 is shown to comprise a processor P and a memory M, said memory comprising instructions executable by said processor P whereby the transition device 500 is operable as described herein.
  • the transition device 500 also comprises a communication circuit C with suitable equipment for transmitting and receiving signals in the manner described herein.
  • the communication circuit C is configured for communication with remote radio units and baseband units using suitable protocols and interfaces depending on how the respective remote radio units and baseband units are operating. Such communication may be performed over wired or optical links depending on the implementation, which is not necessary to describe here as such in any detail.
  • the solution and embodiments herein are thus not limited to using any specific types of networks, technology or protocols for signal communication.
  • the transition device 500 comprises means configured or arranged to perform at least some of the actions 300-310 in Fig. 3 and more or less in the manner described above for the transition devices 200 and 400.
  • the transition device 500 is arranged or configured to enable communication of data between a remote radio unit and a central baseband unit in a wireless network, such as the remote radio unit 202, 402 and the central baseband unit 204, 404.
  • the transition device 500 is configured to detect a first interface configuration used by the remote radio unit 202. This operation may be performed by a
  • the transition device 500 is also configured to detect a second interface configuration used by the central baseband unit 204. This operation may be performed by the detecting unit 500A, e.g. in the manner described for action 304 above.
  • the transition device 500 is further configured to configure one or more interface functions, based on the detected first and second interface configurations, the one or more interface functions being selected from a set of predefined interface functions associated with different interface configurations, such as the above- described predefined interface functions 400A.
  • This operation may be performed by a configuring unit 500B in the transition device 500, e.g. as described for action 306 above.
  • the configuring unit 500B could alternatively be named a control unit, selecting unit or interface unit.
  • the transition device 500 is also configured to establish at least one data flow between the remote radio unit 202 and the central baseband unit 204 over the transition device 200. This operation may be performed by an establishing unit 500C in the transition device 500, e.g. as described above for action 308.
  • the establishing unit 500C could alternatively be named a flow unit or setup unit.
  • the transition device 500 is also configured to perform conversion between the first interface configuration and the second interface configuration for data communicated in the at least one data flow, using the selected one or more interface functions. This operation may be performed by a converting unit 500D in the transition device 500, e.g. as described above for action 310.
  • the converting unit 500D could alternatively be named a translating unit.
  • Fig. 5 illustrates various functional modules or units in the transition device 500, and the skilled person is able to implement these functional modules or in practice using suitable software and hardware.
  • the solution is generally not limited to the shown structures of the transition device 500, and the functional units or modules 500A-D therein may be configured to operate according to any of the features and embodiments described in this disclosure, where appropriate.
  • transition device 500 Another example of how the transition device 500 may be configured is
  • the transition device 500 comprises the functional modules 500A-D and a processor P, the modules 500A-D being configured to operate in the manner described above as controlled by the processor P.
  • the functional modules or units 500A-D described above can be implemented in the transition device 500 by means of suitable hardware and program modules of a computer program comprising code means which, when run by the processor P causes the transition device 500 to perform at least some of the above-described actions and procedures.
  • the processor P may comprise a single Central Processing Unit (CPU), or could comprise two or more processing units such as CPUs.
  • the processor P may include a general purpose
  • the processor P may also comprise a storage for caching purposes.
  • Each computer program may be carried by a computer program product in the transition device 500 in the form of a memory having a computer readable medium and being connected to the processor P.
  • the computer program product or memory in the transition device 500 may thus comprise a computer readable medium on which the computer program is stored e.g. in the form of computer program modules or the like.
  • the memory may be a flash memory, a Random-Access Memory (RAM), a Read-Only Memory (ROM), an Electrically Erasable Programmable ROM (EEPROM) or hard drive storage (HDD), and the program modules could in alternative embodiments be distributed on different computer program products in the form of memories within the transition device 500.
  • the solution described herein may be implemented in the transition device 500 by means of a computer program product 502 comprising a computer program
  • transition device 500 with computer readable instructions which, when executed on the transition device 500, cause the transition device 500 to carry out the actions and features according to any of the above embodiments, where appropriate.
  • a transition device 600 is divided into a first part 600A and a second part 600B to employ the above-described embodiments involving an intermediate interface configuration which is adapted for communication over a packet network 600C.
  • the first part 600A of the transition device is denoted TD1 and the second part 600B of the transition device is denoted TD2.
  • remote radio units are denoted RU and central baseband units are denoted BBU or BPU meaning Baseband Processing Unit.
  • the first part 600A is implemented basically at the RUs and the second part 600B is implemented basically at the BBUs.
  • the first communication scenario a) involves legacy RUs and BBUs where the RUs use CPRI as the first interface configuration and the BBUs also use CPRI as the second interface configuration.
  • the TD1 of the first part 600A converts between CPRI of the RUs and C1 which is used as the intermediate interface configuration for communication over the packet network 600C.
  • the TD2 of the second part 600B converts between the intermediate interface configuration C1 and CPRI used by the BBUs.
  • the second communication scenario b) involves legacy RUs and a 5G BPU where the RUs use CPRI as the first interface configuration and the BPU also use CPRI as the second interface configuration.
  • the TD1 of the first part 600A converts between CPRI of the RUs and C2 which is used as the intermediate interface configuration for communication over the packet network 600C.
  • the TD2 of the second part 600B converts between the intermediate interface configuration C2 and CPRI used by the BPU.
  • the third communication scenario c) involves a reused legacy RU design with the TD1 integrated therein, and a 5G BPU.
  • the RU uses CPRI internally as the first interface configuration and the BPU also use CPRI as the second interface configuration.
  • the TD1 of the first part 600A is thus integrated into the RU and converts between CPRI and either of C1 and C2 which is used as the
  • the TD2 of the second part 600B converts between the intermediate interface configuration C1 or C2 and CPRI used by the BPU.
  • Fig. 7 illustrates how a transition device 700 may be structured when some of the above-described embodiments are employed.
  • the interface functions are configured as Virtualized Network Functions VNFs which are implemented in a software-defined data processing unit 702 in the transition device 700.
  • the interface functions comprise CPRI related functions 702A, eCPRI related functions 702B, multiplexing/ de-multiplexing and switching functions 702C, and packet forwarding functions 702D. Further details in this figure are described below.
  • the transition device 700 offers several interfaces that can be equipped with a common pluggable transceiver, like SFP/SFP+/QSFP in BASE-T or BASE-X flavor.
  • An Interface/Protocol detector 704 is employed to configure interfaces according to different interface types, e.g. CPRI, C1 , C2, C3, eCPRI, and to establish a corresponding VNF chain and data flows.
  • the CPRI-related VNFs 702A may be employed as CPRI framers separating or framing time-domain IQ AxC containers, synchronization data, as well as Operation & Maintenance O&M data. Also, different forms for compression, such as IQ resampling, Huffman coding, etc., may be employed to generate IQ content for a C1 interface.
  • the eCPRI related VNFs 702B may be employed as functions to convert AxCs from time-domain samples to frequency domain-samples by using (inverse) Fourier Transforms.
  • a beam forming processor not shown, may handle any beamforming related functions such UL/DL beam creation (BTA/ATB math) coefficient calculations, and uplink channel sounding (capture of spatial information). Also, compression functions as well as weight coefficients may be applied on frequency samples.
  • the multiplexing/ de-multiplexing and switching functions 702C may be any multiplexing/ de-multiplexing and switching functions 702C.
  • the packet forwarding functions 702D may be employed as a Packet Flow Switch or Forwarding engine.
  • eCPRI data AxC, C1 , or C2
  • All AxCs to one radio unit MIMO layers, spatial layers
  • TSN time-sensitive network
  • O&M and Sync 706 may be employed to provide Software Defined Network SDN controller interfacing based on REST or Netconf. It contains a SW
  • VNFs are stored for staging in a service chain. It also maintains the flow-table for AxC switch and packet forwarding. It also maintains the interface configurations.
  • transition device may be structured for conversion between different interfaces.
  • Fig. 8 illustrates how a transition device 800 may be structured for conversion between a CPRI interface configuration towards the left side of the transition device 800, and a C1 interface configuration towards the right side of the transition device 800.
  • Fig. 9 illustrates how a transition device 900 may be structured for conversion between a CPRI interface configuration towards the left side of the transition device 900 and a C2 interface configuration towards the right side of the transition device 900.
  • the transition device 900 comprises a set of conversion functions 900A. Processing in time domain and in frequency domain are also indicated in this figure.
  • Fig. 10 illustrates how a transition device 1000 may be structured for conversion between a C1 interface configuration towards the left side of the transition device 1000 and a C2 interface configuration towards the right side of the transition device 1000.
  • the transition device 1000 comprises a set of conversion functions 1000A. Processing in time domain and in frequency domain are also indicated in this figure.

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Abstract

La présente invention concerne un procédé et un dispositif de transition (200) destinés à l'établissement de communication de données entre une unité radio distante (202) et une unité de bande de base centrale (204) dans un réseau sans fil. Lors de la détection d'une première configuration d'interface utilisée par l'unité radio distante (202) et d'une seconde configuration d'interface utilisée par l'unité de bande de base (204), le dispositif de transition (200) configure des fonctions d'interface, sur la base des première et seconde configurations d'interface. Les fonctions d'interface sont sélectionnées parmi un ensemble de fonctions d'interface prédéfinies (400A) associées à différentes configurations d'interface. Le dispositif de transition (200) établit ensuite un flux de données entre l'unité radio distante (202) et l'unité de bande de base centrale (204) sur le dispositif de transition (200) et effectue une conversion entre la première configuration d'interface et la seconde configuration d'interface pour des données communiquées dans le flux de données, à l'aide des fonctions d'interface sélectionnées.
PCT/SE2017/050828 2017-08-17 2017-08-17 Procédé et dispositif de transition destinés à l'établissement de communication de données dans un réseau sans fil Ceased WO2019035750A1 (fr)

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ES17758653T ES2964760T3 (es) 2017-08-17 2017-08-17 Método y dispositivo de transición para habilitar la comunicación de datos en una red inalámbrica
EP17758653.4A EP3669567B1 (fr) 2017-08-17 2017-08-17 Procédé et dispositif de transition destinés à l'établissement de communication de données dans un réseau sans fil
US16/628,890 US11337114B2 (en) 2017-08-17 2017-08-17 Method and transition device for enabling communication of data in a wireless network
PCT/SE2017/050828 WO2019035750A1 (fr) 2017-08-17 2017-08-17 Procédé et dispositif de transition destinés à l'établissement de communication de données dans un réseau sans fil
EP23201077.7A EP4277439A3 (fr) 2017-08-17 2017-08-17 Procédé et dispositif de transition pour permettre la communication de données dans un réseau sans fil
US17/726,616 US11902834B2 (en) 2017-08-17 2022-04-22 Method and transition device for enabling communication of data in a wireless network
US18/536,441 US12238581B2 (en) 2017-08-17 2023-12-12 Method and transition device for enabling communication of data in a wireless network
US18/987,371 US20250119793A1 (en) 2017-08-17 2024-12-19 Method and transition device for enabling communication of data in a wireless network

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ES2964760T3 (es) 2024-04-09
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US20250119793A1 (en) 2025-04-10
US11337114B2 (en) 2022-05-17
US20200236592A1 (en) 2020-07-23
EP3669567A1 (fr) 2020-06-24
EP4277439A2 (fr) 2023-11-15
US12238581B2 (en) 2025-02-25
US20220248269A1 (en) 2022-08-04
US11902834B2 (en) 2024-02-13

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